body,h1,h2,h3,h4,p,div,li,ul,table,td,tr,span,a,dl,dt,dd,input,thead,tbody,footer,aside,header{
    margin:0;
    padding:0;
    box-sizing: border-box;
    outline: none;
    border: none;
    list-style: none;
    font-family: "Microsoft Yahei",  "微软雅黑", "宋体", Tahoma, Arial, Helvetica, STHeiti;
}
body{
    background: #f5f5f5;
}
.header{
    height: 50px;
    width: 100%;
    background: #1a1a1a;
    position: fixed;
    top:0;
}
.header a{
    position: absolute;
    top:0;
}
.header img{
    height: 20px;
    margin-top: 14px;
    margin-left: 10px;
}
.header p{
    color: #fff;
    line-height: 50px;
    width: 100%;
    text-align: center;
    font-size: 18px;
}
.logo img{
    height: 70px;
    display: block;
    margin:  60px auto;

}